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There is no need for the 6.5" elements, unless you have a UHF SWR meter and want to spend a lot of time installing the antenna, measuring SWR, taking it down, trimming the elements, re-installing the antenna, measuring SWR, taking it back down, trimming the elements again, etc., etc. until you get it set for one precise frequency. The common version of this antenna uses all 19.5" elements -- ONE up and four down -- is easier to build, gives dual band performance at least as good as this more complicated version, and a significantly smoother omnidirectional radiation pattern.Hams should know that a quarter-wave element for 2m VHF will also work as a three-quarter-wave element on 70cm UHF.
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